Handle 400 error code when attempting to fetch clone bundle.
Handle 400 error code when attempting to fetch clone bundle.

Gitlab returns a 400 error when trying to fetch clone.bundle
from a repository containing the git-repo tool. The repo
launcher doesn't then fall back to not using a clone.bundle
file and the repo init fails.

Change-Id: Ia3390d0638ef9a39fb2fab84625b269d28caf1cc
Signed-off-by: Craig Northway <02200a781bdbbf360e24eba25284d8b7195830eb@codeaurora.org>
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/305382
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@google.com>

lewixliu/git-repo,GerritCodeReview/git-repo,couchbasedeps/git-repo,GerritCodeReview/git-repo,lewixliu/git-repo,couchbasedeps/git-repo